What types of seals are commonly used in modern gas turbine engines to prevent oil leakage?

In modern gas turbine engines, labyrinth and carbon seals are often employed to effectively prevent oil leakage. Labyrinth seals consist of a series of interlocking, convoluted paths that create turbulence and minimize airflow, which helps to contain oil and maintain system efficiency. They work by using the geometry of the seal to trap oil within a chamber, allowing only minimal leakage, which is particularly important in high-speed rotating components.

Carbon seals, typically made from a carbon-graphite composite, are utilized in areas where high temperatures and pressures are present. They can provide excellent sealing performance due to their ability to withstand thermal expansion and provide a tight seal against oil leakage, as well as their low friction characteristics.

This combination of labyrinth and carbon sealing technologies is crucial in enhancing the reliability and efficiency of gas turbines, ensuring that oil systems remain contained and protected from external influences while minimizing maintenance requirements. Their design is also tailored to the extreme operating conditions of gas turbines, making them ideal for such applications.